Whether you're navigating a wet and brushy approach below treeline or a long traverse across high alpine ridge lines during the summer climbing season, the Arc'teryx Women's Atom SL Hooded Jacket offers lightweight insulation, wind-resistance, and the breathability needed to keep moving at a quick clip. New for this season, the Atom SL has a hybrid construction that combines the insulating properties of a synthetic fill jacket with the breathability of a stretch fleece piece. The body consists of 20D nylon that's treated with a DWR finish to repel moisture, while the sides are fitted with a breathable and stretchy Torrent fleece fabric to keep the jacket breathable during those highly aerobic ascents. The hood is uninsulated to help keep your dome dry and cool when you're on the move, and the No Slip Zip center zip is specifically engineered to stay put throughout the day.

The bighorn sheep is the mammalian symbol of Colorado Parks and Wildlife and Colorado's official animal. Colorado is home to the largest population of the species anywhere. The animals are five to six feet long with a tail three to six inches in length.